3-28 Figure 3-33.—AC component in an LC choke-input filter. You now have a voltage divider as illustrated in figure 3-34. You should see that because of the impedance ratios, a large amount of ripple voltage is dropped across L1, and a substantially smaller amount is dropped across C1 and R_{L}. You can further increase the ripple voltage across L1 by increasing the inductance: X_{L}= 2!fL Figure 3-34.—Actual and equivalent circuits. Now let's discuss the dc component of the applied voltage. Remember, a capacitor offers an infinite (") impedance to the flow of direct current. The dc component, therefore, must flow through R_{L}and L1. As far as the dc is concerned, the capacitor does not exist. The coil and the load are, therefore, in series with each other. The dc resistance of a filter choke is very low (50 ohms average). Therefore, most of the dc component is developed across the load and a very small amount of the dc voltage is dropped across the coil, as shown in figure 3-35.